Periodic drops in fps

## Bevy version
Version `0.15.3`, with features: [`"animation", "bevy_animation", "bevy_asset", "bevy_audio", "bevy_color", "bevy_core_pipeline", "bevy_gilrs", "bevy_gizmos", "bevy_gltf", "bevy_mesh_picking_backend", "bevy_pbr", "bevy_picking", "bevy_render", "bevy_scene", "bevy_sprite", "bevy_sprite_picking_backend", "bevy_state", "bevy_text", "bevy_ui", "bevy_ui_picking_backend", "bevy_window", "bevy_winit", "default_font", "multi_threaded", "smaa_luts", "sysinfo_plugin", "tonemapping_luts", "x11", "qoi", "shader_format_spirv"`]
(I have seen this happen with default features too)
Edit: this even happens with the minimum features:
```toml
bevy = { version = "0.15.3", default-features = false, features = ["default_font", "bevy_winit", "wayland"] }
iyes_perf_ui = { version = "0.4.0", default-features = false, features = ["entries"]}
```

## What you did

Write a simply app that uses iyes_perf_ui to observe fps.
Code:
```rs
use bevy::{diagnostic::FrameTimeDiagnosticsPlugin, prelude::*, render::diagnostic::RenderDiagnosticsPlugin};
use iyes_perf_ui::{entries::PerfUiFramerateEntries, PerfUiPlugin};

fn main() -> AppExit {
App::new()
.add_plugins(DefaultPlugins)
.add_plugins(FrameTimeDiagnosticsPlugin)
.add_plugins(bevy::diagnostic::EntityCountDiagnosticsPlugin)
.add_plugins(bevy::diagnostic::SystemInformationDiagnosticsPlugin)
.add_plugins(RenderDiagnosticsPlugin)
.add_plugins(PerfUiPlugin)
.add_systems(Startup, init)
.run()
}

fn init(mut commands: Commands) {
commands.spawn(Camera2d);
commands.spawn(PerfUiFramerateEntries::default());
}
```

## What went wrong

Every so often fps drop drastically for some (fairly short) period of time.
This can be observed in `iyes_perf_ui` by looking at the `FPS (min)` and `Frame Time (max)` values.

## Additional information

Video: https://github.com/user-attachments/assets/8ae90b2f-8768-454e-a33a-0ff224e1c422
Ran using `cargo run --release`
`log` and `tracing` crates set to `"max_level_info", "release_max_level_warn"`

Start with the minimal Bevy application in the issue, including `main`, `init`, `PerfUiPlugin`, and the diagnostic plugins, and reproduce it with `cargo run --release`. Compare the full-feature and minimum-feature configurations, then trace the periodic frame-time spikes from the reported FPS and frame-time values. Done means the cause is identified and the periodic drops are prevented or clearly characterized.

Written by the indexing model from the issue text.